KOROK® has 2-way fire-rated wall systems for fire separation of Scissor Stairs or any Stairs.

KOROK® Scissor Stair Systems are proprietary, non-loadbearing, two-way fire-rated wall systems designed to provide fire and acoustic separation between independent stair flights within scissor stair configurations or other stair arrangements.

The system utilises 78mm thick interlocking KOROK® panels installed between two independent stair stringers to form a continuous fire-resisting barrier. Panels may be oriented vertically, horizontally, or in combination to suit stair geometry and construction sequencing requirements.

The system is BRANZ tested and Warringtonfire assessed, and is intended to meet or exceed the performance requirements of the New Zealand Building Code (NZBC) and NCC Australia within the defined scope.

How the System Works

KOROK® Scissor Stair Systems are constructed using 78mm thick panels comprising roll-formed galvanised or colour steel outer shells with an aerated concrete core and interlocking tongue-and-groove profiles, forming a continuous, tightly sealed wall plane that reduces the risk of acoustic leakage between stair flights. The system is non-combustible and provides two-way fire resistance when exposed from either side. In fire conditions:

• Horizontal fire resistance is achieved through a quadrilateral fire-resistant section formed between the two independent stairs
• Vertical fire resistance is achieved through the wall-to-stair stringer boundary condition

KOROK® Scissor Stair Systems provide independently tested Fire Resistance Ratings up to –/120/120 and –/60/60 depending on configuration, while the 78mm interlocking panels deliver acoustic performance up to STC 76, meeting or exceeding NZBC Clause G6 requirements through their aerated concrete core and tightly sealed joint geometry.

Download Technical Data and CAD Drawing 

When it comes to passive fire penetrations, KOROK® leads the way with innovative solutions that ensure fire safety without compromising functionality.

At KOROK®, we are committed to providing fire-rated wall systems that prioritize safety, durability, and performance. Our advanced KOROK® panels are specifically designed to allow seamless integration of passive fire penetrations, including service ducting and pipes, while maintaining the structural and fire integrity of the wall.

What Are Passive Fire Penetrations?

Passive fire penetrations are openings or pathways in fire-rated walls or floors that allow services such as plumbing, electrical cables, or ductwork to pass through. These penetrations are essential for building functionality but must be carefully designed to prevent the spread of fire and smoke. KOROK® panels are engineered to make the creation and sealing of these penetrations straightforward and effective, ensuring compliance with strict fire safety standards.

Fire Stopping Guidance Documents

At KOROK®, we understand that ensuring fire safety goes beyond the wall system itself – it’s also about how penetrations and services are detailed. That’s why we’ve collaborated with leading experts in passive fire protection to develop a suite of manuals that provide fully tested, NZBC-compliant solutions for penetrations in KOROK® fire-rated wall systems.

Each manual has been developed in partnership with industry specialists and contains tested configurations, installation guidance, and compliance references, making it easier for designers, engineers, and contractors to select the right firestop solutions.

Our firestop manuals, developed with industry partners, provide tested and NZBC-compliant solutions for service penetrations in KOROK® fire-rated wall systems.

Why Choose KOROK® for Passive Fire Penetrations?

• Easy Formations for Penetrations: KOROK® panels simplify the creation of openings for ducting and plumbing. The lightweight yet robust design makes it easy to form precise and efficient penetrations without compromising fire safety or wall integrity.
• Maintained Wall Integrity: Even with multiple passive fire penetrations, KOROK® panels ensure the overall wall system retains its fire rating. This is crucial for preventing fire and smoke from spreading across compartments in a building.
• Versatile Applications: Whether your project involves commercial spaces, residential apartments, or industrial facilities, KOROK® passive fire penetrations provide a reliable and efficient solution tailored to meet your needs.
• Compliance with Building Codes: KOROK® panels are rigorously tested and meet or exceed New Zealand’s building code requirements for passive fire protection. This gives architects, engineers, and builders confidence in the safety and performance of their projects.

Service Penetrations – KOROK® 51mm & 78mm Panel

CASE STUDY

Hobsonville Point: Enhancing Fire and Acoustic Protection with KOROK® Intertenancy Systems

Bringing Kiwi Ingenuity to Hobsonville Point Homes

Here at KOROK®, we’re stoked to have been part of the transformation of the old Hobsonville airbase into a new community. Our innovative KOROK KIR Intertenancy Residential Walls have been key in shaping around 3000 homes across this significant slice of land, including standout spots like the Te Uru Apartments, Walter Merton Road Terraces, Nugget Avenue Terraces, and Buckley A Precinct.

Being part of the Hobsonville Point development really showcases our ability for coming up with smart solutions that tackle the real-world challenges of modern building, especially when it comes to keeping fires at bay and cutting down on noise. Traditional wall setups in flats and hotels usually lean on linings to do this job. But our KIR walls change the game by ditching the need for these linings up top, making the whole building process simpler and slicker.

Smoother Sailing in Building and Design

Our walls have made it quicker and easier to get buildings up at Hobsonville Point. That’s good news for the teams on the ground and means residents can start enjoying their new digs sooner.

Keeping Costs Down

Thanks to the technology behind our KIR panels, we’ve cut down on waste, which means saving some dollars. Those savings can help make other parts of the development even better, making the whole neighbourhood a top spot to live.

Top-Notch Fire and Sound Safety

We’ve put our walls through the wringer to make sure they’re up to scratch for fire safety and noise control. That means folks living in Hobsonville Point can sleep easy, knowing they’ve got solid protection around them.

Built Solid for Extra Peace of Mind

The sturdy design of our walls means homes are not just safe but also built to last. That’s a big plus for anyone calling Hobsonville Point home, offering a secure spot for years to come.

Committed to Excellence in Innovation and Community Building

From the lively look of the Te Uru Apartments to the tidy and thoughtful design of the Walter Merton Road Terraces and the spot-on style of Buckley A Precinct, our KIR panels have been a foundation for success, delivering the goods on fire safety and quiet living. As we look back on our role at Hobsonville Point, we’re chuffed to have delivered solutions that not only tick the boxes for what’s needed in today’s building scene but also help forge strong, safe, and green communities. Our dedication to coming up with better ways to do things will keep us at the forefront of making homes better for Kiwis everywhere.

Related Projects

Designing cantilevered terraced houses is simplified with KOROK® fire and acoustic wall systems. Whether you need cantilevered eaves or cantilevered walls, KOROK has detailed solutions to suit your needs.

Our systems help you create functional and stylish designs, such as:

• Maximizing floor space with larger second-story extensions.

KOROK’s innovative cantilevered wall systems are engineered to provide superior performance, offering both structural stability and efficient installation for terraced house construction. Choose KOROK® to streamline your building process and meet the demands of modern architectural design.

For Terraced Housing

Cantilevered terraced house design is easy with KOROK®. We have details for both cantilevered eaves and cantilevered walls. So if you’re wanting your buyers to be sheltered from the weather with an inset front door; or if you’re wanting to maximise your floor space with a larger second storey, we have the product to make that happen.

Cantilevered Eaves

Cantilevered Walls

For External Applications – (Commercial Only)

A Typical Parapet Detail illustrates the structure and support of a parapet wall, commonly cantilevered from the main building structure. This detail focuses on connections that ensure stability and durability, including reinforcement and weatherproofing layers to protect against the elements. Cantilevered parapets require careful attention to load distribution and deflection control, as they extend outward without external bracing, creating a clean, streamlined edge on the building façade.

Typical parapet detail

Typical parapet detail

High Performing and Lightweight

KOROK® 78mm galv panels are precision rollformed from high-quality zinc-coated steel strips. The steel used for our shells meets the AS/NZS1397:2001 standard, ensuring consistent strength and durability. Each panel features a base metal thickness of 0.4 mm B.M.T. with a Z275 zinc coating, enclosing a lightweight aerated concrete core. This combination delivers a nominal weight of just 10.2 kg per lineal metre, making KOROK® panels easy to handle and install while maintaining exceptional structural performance.

Our panels are designed for versatility and high performance, offering superior fire and acoustic ratings for a wide range of applications. They provide fast, efficient installation with minimal on-site modifications, reducing labour costs and program delays. The lightweight nature of KOROK® panels also eases transport and handling, particularly on multi-storey construction projects.

Backed by over 20 years of experience, KOROK® panels are BRANZ-appraised, Kiwi-owned, and widely trusted across New Zealand for projects ranging from residential developments to complex commercial constructions. Our systems are designed to simplify installation, maximise safety, and deliver long-lasting performance, making KOROK® the preferred choice for builders, architects, and developers seeking reliable fire and acoustic wall solutions.

KOROK® 78mm galv panels are used for:

• KOROK® Intertenancy Terraced Housing Wall Systems

• KOROK® Warehouse, Retail, Factory Wall Systems

• KOROK® Intertenancy Apartment Wall Systems

• KOROK® Lift Shafts, Risers, Ducts Wall Systems

• KOROK® Overclad External Wall Systems

• KOROK® Cinema Wall Systems

Related Products

Engineered Solid Intertenancy Walls for Multilevel Compliance

In apartment and multi-unit developments, intertenancy walls must provide more than separation – they must deliver reliable fire containment, acoustic privacy, and long-term durability. KOROK® Intertenancy Apartment Systems provide high-performance fire- and acoustic-rated protection for non-loadbearing internal walls. Designed for compliance, construction efficiency, and occupant comfort, the system delivers robust solid-wall performance while meeting the requirements of the New Zealand Building Code (NZBC).

Designed for use in:

• Apartment buildings
• Multi-storey residential developments
• Hotels and retirement complexes
• Mixed-use multi-unit projects

With fire ratings available up to -/240/240 and acoustic performance up to STC 76, the system provides flexibility for designers while delivering reliable, tested performance. BRANZ appraised and developed using recognised Australian and New Zealand Standards, KOROK® systems combine solid-wall resilience with construction efficiency.

How the System Works

KOROK® Intertenancy Apartment Systems use roll-formed steel-faced panels filled with aerated concrete to form a solid, high-mass fire and acoustic barrier between occupancies. The panels interlock to form a continuous wall with inherent fire resistance and sound attenuation properties. Unlike lightweight framed plasterboard systems that rely on linings for performance, the KOROK® panel itself is the primary fire barrier.

The aerated concrete core provides substantial mass, improving low-frequency sound attenuation and reducing airborne sound transfer between dwellings. The solid wall configuration also allows services to be run on the intertenancy wall without requiring individual fire-rated penetrations for outlets and switches, as fire resistance is inherent within the panel. Panels may be installed vertically or horizontally and are available in multiple configurations to achieve varying Fire Resistance Ratings (FRR) and Sound Transmission Class (STC) levels.

KOROK Intertenancy Apartment Systems

Quick to Install, Built to Protect

In modern terraced housing and townhouses, intertenancy walls must do more than divide spaces – they must protect lives, property, and privacy. The KOROK® Intertenancy System delivers high-performance fire- and acoustic-rated protection walls that’s fast to install, robust, and fully compliant with both the New Zealand Building Code (NZBC) and the Building Code of Australia (BCA).

How the System Works

The KOROK® system uses steel-shelled, aerated-concrete panels positioned between double wall frames. Aluminium brackets connect the panels to both sides. In the event of a fire, brackets on the fire-exposed side melt – allowing that side to safely detach – while the opposite side remains intact. This keeps the fire barrier securely in place, maintaining structural stability and preventing fire spread to the neighbouring unit. Unlike conventional wall systems that rely on internal plasterboard linings for protection, the KOROK® panel itself is the primary fire barrier, providing enduring strength and resilience.

Engineered for Modern Terraced Living

Whether you’re building townhouses, apartments, or multi-unit developments, KOROK® Intertenancy Systems combine with construction efficiency – delivering fire safety, acoustic comfort, and peace of mind for occupants and builders alike.

KOROK Intertenancy Terraced Housing Systems